Republic P-47 Thunderbolt! The Republic P-47 Thunderbolt, also known as the "Jug," was the biggest, heaviest, and most expensive fighter aircraft in history to be powered by a single reciprocating engine. It was one of the main United States Army Air Forces (USAAF) fighters of World War II, and served with other Allied air forces. The P-47 was effective in air combat but proved especially adept at ground attack. It had eight .50-caliber machine guns, four per wing. When fully loaded the P-47 could weigh up to eight tons. A modern-day counterpart in that role, the A-10 Thunderbolt II, takes its name from the P-47.
Built in greater quantities than any other US fighter, the P-47 was the heaviest single-engine WWII fighter to go into production and the first piston-powered fighter to exceed 500 mph. The Thunderbolt performed 546,000 combat sorties between March of 1943 and August 1945 and is considered the real forerunner of today's multirole fighters.

http://www.aviation-history.com/republic/p47.html

http://en.wikipedia.org/wiki/Republic_P-47_Thunderbolt

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